1985 Ski-Doo snowmobile Service Manual, Page 320Get this manual
Section 03 TRANSMISSION Sub-section 08 (GEAR BOX)
To obtain the proper drive shaft clearance it may be necessary to add or remove shim(s) between the key side bearing and the shaft bearing shoulder
,CAUTION: The finger of the gear change shaft must not block the gear change fork
17,18,20, Gear change forkcomponents 28,38, Sprocket alignment
Verify sprocket alignment using the alignment tool (PIN 420 476 010)Proceed as follows:Set alignment tool on shift sprocket 19 th and turn it into the corresponding layshaft and tensioner sprockets as illustratedMount gear change fork and index rod with index spring and ballTo do this, press ball and index spring into the bore of gear change using ball mounting bolt PIN 420 476 020 then the ball mounting bolt is pushed through with the index rod and the index rod is screwed inTransmission
Index rod